Small signal amplifier for underground engineering parameter test

A technology of engineering parameters and amplifiers, applied in measurement, wellbore/well parts, earthwork drilling and production, etc., can solve the problems of difficult detection and easy to be submerged in noise, etc., to eliminate noise interference, obvious use effect and reasonable design Effect

Inactive Publication Date: 2011-06-15
武侯区巅峰机电科技研发中心
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In addition, the signal amplitude of downhole engineering parameters is very small, generally in the order of μV, which is easily submerged in noise and difficult to be detected

Method used

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  • Small signal amplifier for underground engineering parameter test
  • Small signal amplifier for underground engineering parameter test

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Embodiment Construction

[0028] Such as figure 1 As shown, the small-signal amplifier for the downhole engineering parameter test includes a voltage source, a preamplifier, a low-pass filter, a high-pass filter, a notch filter, a post-amplification circuit and an A / D converter connected in sequence.

[0029] The voltage source is connected with the preamplifier through a bridge circuit. The size of the voltage source is determined by the downhole engineering conditions, generally 0 ~ 100μV.

[0030] The preamplifier is a fixed gain amplifier or a programmable gain amplifier.

[0031] The post-amplification circuit is an amplifier with adjustable gain.

[0032] Each module of the present invention is described in detail below.

[0033] 1. Preamplifier

[0034] Since the signal voltage output from the downhole sensor is a μV level signal. It may even be overwhelmed by noise and cannot be converted directly. The signal-to-noise ratio must be improved through a preamplifier to improve signal performa...

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Abstract

The invention discloses a small signal amplifier for an underground engineering parameter test and belongs to signal amplification technologies. The small signal amplifier mainly solves the problem that signals are difficult to accurately test due to over strong signal interference during the underground engineering parameter test in the prior art. The small signal amplifier for the underground engineering parameter test comprises a voltage source, a preamplifier, a low-pass filter, a high-pass filter, a trapper, a post-stage amplifying circuit and an analog to digital (A/D) converter which are connected sequentially, wherein the voltage source is connected with the preamplifier through a bridge type circuit; the preamplifier is a fixed gain amplifier or a program-controlled gain amplifier; and the post-stage amplifying circuit is a gain-adjustable amplifier. The small signal amplifier has a reasonable design and stable component performance, can effectively eliminate noise interference around the signals in underground engineering and improves the accuracy of the signal parameter test.

Description

technical field [0001] The invention relates to an amplifier, in particular to a small signal amplifier used for testing downhole engineering parameters. Background technique [0002] Downhole engineering parameters include pressure, temperature, drilling pressure, torque, acceleration, bending stress and other parameters, all of which come from various sensors on the drilling site. Several thousand meters downhole, the environment is very harsh, the temperature is as high as 200°C, the pressure is as high as tens of MPa, the drill bit generates strong vibration during work, and the corrosiveness of drilling fluid will have a significant impact on downhole instruments. The signal output by this sensor will be mixed with various noises generated by the downhole environment. At the drilling site, the shielding interference of heavy equipment such as derricks and large electromagnetic equipment such as drilling fluid pumps and generators also have strong interference. In addi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00
Inventor 黄友华
Owner 武侯区巅峰机电科技研发中心
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